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Steampunk C02 Gatling Gun & Costume 


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Steampunk C02 Gatling Gun & 


Written By: Todd A Marks 



• Dremel tool m 

• 10 lb. C02 fire extinguisher (1) 

• Misc. shop tools (1) 

Power drill or drill press (1) 

• Soldering iron (1) 


This project requires knowledge of woodworking, metal working, simple electronics, and 
access to a lot of parts. It runs off a battery and C02. 

The C02 tank is carried in a rolling backpack. A quick-release hose connector permits the 
gun to be carried without a tether, and allows quick C02 tank swaps as needed. 

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Pagel of 17 

Steampunk C02 Gatling Gun & Costume 

Step 1 — Steampunk C02 Gatling Gun & Costume 

• Drill 1/4" holes every 1 1/2" in six 
14"-long thin walled 3/4" PVC 
pipes. Paint them black. 

Step 2 

• Drill six 3/4" holes evenly spaced and centered into two round 6" sanding disks. 

• Disks should be plastic on the back, and rubber and velcro on the other side. There should 
be a threaded bolt that is centered in the disk. 

• Once the holes are drilled and lined up, insert the pipes. Push them through so that the 
front of the pipes protrude 2 inches. 

• The bottom disk's pipes should protrude about 3/4". Make sure the pipes are all even and 
that the disks are straight. 

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Steampunk C02 Gatling Gun & Costume 

Step 3 

• A motorcycle's wheel hub is used to hold the sealed bearing (allowing for the barrel to turn) 
and to hold the C0 2 nozzle. 

• A hole is drilled all the way through a piece of metal that is mounted in the center of the 
sealed bearing. The threaded bolt from the bottom plastic sanding disk (which holds the 
gun barrel pipes) is attached and tightened to the front of the hub as shown. 

• In a later step, a threaded rod will attach to the threaded hole in the back of the hub. This 
rod will attach to a screw gun motor on the other end of the unit; that will turn the gun 

• The gun barrel unit should rotate freely when it is spun. 

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Steampunk C02 Gatling Gun & Costume 

Step 4 

• The fire extinguisher hose is 
attached to a brass nozzle which is 
threaded through the wheel hub. 

• The nozzle needs to be lined up 
and mounted so that the C0 2 flows 

through the barrels. 

• The nozzle is notched toward the 
right so that the force of the C0 2 

will cause the barrel unit to rotate. 

Step 5 


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• A power screw gun should be taken 
apart to be used as the turning 
mechanism when CO2 is not being 


• This will allow the motor to be 
powered and switched on 

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Steampunk C02 Gatling Gun & Costume 

Step 6 

• Use a heavy-duty metal outdoor 
light fixture as the rear of the gun. 
Remove all electrical components 
from inside the fixture. 

Step 7 

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Easy-turning ratchet attaJMied :to dri I, secure alw. 


Drill motor mounted to wood base 

• A base made of 2"x3" wood should 
be cut and shaped to fit into the 
bottom of the light fixture. 

• A hole for the drill motor should be 
cut all the way thru the wood. Make 
sure there are holes drilled into the 
side of the wood to provide 
ventilation for the motor. 

• An easy-turning ratchet should be 
attached to the drill and secured 
with electrical tape. 

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Steampunk C02 Gatling Gun & Costume 

Step 8 

• Size the wood block so that it fits 
snugly into the bottom of the metal 

• If necessary, notch the wood to fit 
over any raised metal tabs inside 
the unit. 

Step 9 

• A hole is drilled to allow the motor 
to be mounted in the wood block. 
Use silicon tape wrapped around 
the motor to hold it snug in the 

• The bottom of the block will be 
placed in the bottom of the metal 

• Wires are soldered to the motor's 
contact points. Heat-shrink tubing 
is used to protect the exposed 

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Steampunk C02 Gatling Gun & Costume 

Step 10 

• Using a grinder or heavy-duty 
Dremel tool, cut an oval hole on the 
bottom of the light housing (the 
light is inverted so that the 
adjustable pipe is now on top, and 
used as a top handle.) 

• The hole should be cut near the 
back of the unit and should not 
interfere with the wood base 
holding the drill motor. 

• The C0 2 hose (and some wiring if 

lights are added in the unit) will be 
routed thru the hole. 

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Steampunk C02 Gatling Gun & Costume 

Step 11 

• Place the wood block into the 
bottom of the metal housing. Use 
four 6 3/4" self-tapping screws to 
drill through the base and secure 
the wood block. 

• Make sure that the screw gun's tip 
is centered when securing the 

• Add a PVC 1/2" threaded piece and 
a threaded 1/2" to 3/4" elbow piece 
to the pipe running out of the 

• Test the direction of the motor by 
applying power to it. It should be 
wired so that the motor turns in the 
same direction (to the right) as the 
CO2 nozzle pushes the barrels. 

• Bring one of the motor's wires 
through the PVC handle, and thread 
an additional wire through the 
handle and out the center hole in 
the back of the metal housing. 
Take the second wire from the 
motor and route it out the back of 
the metal housing. 

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Page 8 of 17 

Steampunk C02 Gatling Gun & Costume 

Step 12 

• A very long threaded rod can be 
used to connect the screw gun to 
the sealed bearing at the rear of the 
gun barrel. 

• It can be tricky to get everything to 
line up and connect properly. The 
rod needs to be cut to the correct 
length (which will be more evident 
in the following steps). 

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Steampunk C02 Gatling Gun & Costume 

Step 13 

• Mount four "L" brackets to the bottom edge of the hub unit. They should be evenly spaced 
and secure. (Five are shown in the first image, but that was reduced to four evenly-spaced 
brackets in the final installation). 

• A long plastic tube (a film developing tube, available on eBay) will be attached to the metal 
light fixture housing (base) to extend the length of the gun. The plastic tube should fit 
snugly over the opening of the metal base. 

• The wheel hub holding the spinning barrels should be mounted in the tube about 6" from 
the top (front) of the tube. 

• Place the hub and "L" brackets in position and mark where the holes should go. Holes 
should be predrilled in the tube, then the brackets positioned and fastened with screws, 
nuts and locking washers. Tighten well. 

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Steampunk C02 Gatling Gun & Costume 

Step 14 

• Connect threaded rod from the screw gun motor to the back of the threaded sealed 

• Position and center the light fixture (base), making sure that the C0 2 nozzle is at the top 
(lined up with the handle in the base). 

• Make sure hoses and wires don't interfere with the turning of the barrels. 

• Secure the tube to the light housing. Pre-drill 6-8 holes every 3-4" around the edge of the 
tube. Use self-tapping screws to secure the two pieces together. 

• Assistance may be needed to hold the two pieces secure and aligned as the screws are 

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Steampunk C02 Gatling Gun & Costume 

Step 15 

• Using newspaper, mask off the gun barrels. Spray paint the rest of the unit bronze. 

• A hose hanger (found at hardware stores) is used as the front handle of the gun. Electrical 
or handlebar tape is added on top to improve the grip. 

• A hole is drilled on each side through the handle and the plastic tube. Washers are placed 
on both sides of the handle to provide a smooth movement. Inside, a locking washer and 
nut are attached to a threaded bolt. 

• Round foam or handlebar covers can be used at the base of each "foot" on the handle to 
protect the tube from being scratched and to allow the unit to be placed on the ground 

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Steampunk C02 Gatling Gun & Costume 

Step 16 

• Heavy duty metal threaded 45- and 
90-degree pipe parts are used for a 
flexible C0 2 delivery to the gun. In 

this case, motorcycle oil-line 
connectors were used for their size 
and strength. 

• A 3/4" diameter flash-light switch is 
connected to the wires and inserted 
and attached to the PVC elbow. 
The switch is wired to turn the 
screw gun motor on and off. 

• Fire extinguisher hose is attached 
to the pipe, run through the tube 
and connected to the C0 2 nozzle 

near the rotating barrels. 

• CAUTION: The C0 2 is under VERY 

high pressure. Be sure to use nylon 
pipe tape at every pipe connection 
point. Wrench-tighten and secure 
all fittings and connectors. 
Pressure-test and adjust to 
eliminate any leakage. 

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Steampunk C02 Gatling Gun & Costume 

Step 17 

• Wires to the battery holder are 
routed through a flexible hose held 
in place with plastic pipe holders. 
Self-tapping screws are used to 
hold them in place. 

• Fire extinguisher hose is attached 
to the intake connector and runs 
into the interior where it is 
connected to the back of the CO2 

nozzle at the rear of the wheel hub. 

Step 18 

• The screw-gun motor is powered 
by a battery pack which is mounted 
on the side of the unit in a closable 
plastic case (in this case, an old 
drill bit holder). The wires can be 
soldered or attached via a quick- 
release connector. 

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Steampunk C02 Gatling Gun & Costume 

Step 19 

• A high-strength industrial air nozzle 
with a trigger handle is used to 
regulate and control the flow of 
C0 2 when "firing" the gun. 

• The handle is zip-tied to the PVC 
and metal pipe handle of the metal 
light housing. Make sure to cut the 
excess pieces of the zip-ties flush 
to avoid any injuries from sharp 

• Heavy-duty vinyl tape is used to 
secure the nozzle gun to the PVC 

• A threaded heavy-duty quick- 
release connector is inserted into 
the intake side of the air nozzle. 
More details are in the next step. 

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Steampunk C02 Gatling Gun & Costume 

Step 20 

• A heavy-duty quick-release air- 
valve connector with safety shut- 
off valve is connected to the hose 
coming from the C0 2 tank. This is 

then connected to the intake 
connector on the air-nozzle 

• All connectors, pipes, and fittings 
need to have nylon tape at the 
connection points. Everything must 
be wrench-tightened and pressure- 

• Gloves should be worn while 
operating the unit to prevent any 
freeze-burns. Do not operate in 
closed spaces. 

• Do not shoot directly at people. 

• Adult supervision is required. 

• A hose clamp can be used to keep 
the handle valve of the C0 2 fire 

extinguisher open while using the 
gun. This allows quick deployment 
and shut-off (the clamp can be slid 
on and off quickly if it is not fully 

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Steampunk C02 Gatling Gun & Costume 

Step 21 

• Here is the final gun with all the 
bells and whistles added. 

• A shoulder strap can be added to 
help carry the unit. 

Step 22 

• Here is the Steampunk C0 2 Gatling Gun completed with the full costume. 

It is one of the "coolest" costume weapons you will probably see. 
Check it out in action: AKs 

This document was last generated on 2012-11-03 01 :01:06 AM. 

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